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Food You Shouldn't Reheat in the Microwave

Jul 9, 2025 - By the dedicated team of editors and writers at Newsletter Station.

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Microwaves have become an essential kitchen appliance, making reheating leftovers and cooking convenient and quick. While microwaves are convenient, certain foods should be avoided when reheating in them. Microwaving these foods can not only lead to unsavory results but can also be unsafe in some cases.

This blog post will explore the foods you should never reheat in the microwave and why.
  1. Hard-Boiled Eggs
    Hard-boiled eggs are a great source of protein and can be a tasty snack or addition to salads. However, microwaving them can be a recipe for disaster. The rapid heating in a microwave can cause steam to build up within the egg, leading to the risk of it exploding. If you must reheat hard-boiled eggs, it's safer to do so in a pot of simmering water.
  2. Breast Milk
    As a parent or caregiver, you should never reheat breast milk in the microwave. Microwaving can create hot spots that can scald your baby's mouth. Instead, gently warm breast milk by placing the container in a bowl of warm water or using a bottle warmer.
  3. Fried Foods
    Fried foods, such as chicken tenders, French fries, or fried fish, can become soggy and lose their crispy texture when reheated in the microwave. To retain their crunchiness, it's best to reheat them in an oven or toaster oven at a lower temperature, allowing the heat to distribute evenly.
  4. Rice
    Reheating rice in the microwave might seem convenient, but if not done correctly, it can lead to bacterial growth. Rice can contain Bacillus cereus spores, a bacterium that can survive cooking. When rice is left at room temperature and then reheated in the microwave, these spores can multiply, potentially leading to food poisoning. To reheat rice safely, use a stovetop or oven, ensuring it reaches an internal temperature of at least 165°F (74°C).
  5. Pasta with Tomato Sauce
    Microwaving pasta with tomato sauce can lead to uneven heating and create hot spots that can cause burns to your mouth. Instead, consider reheating pasta on the stovetop and adding water or sauce to prevent it from drying out.
  6. Breast Milk
    As a parent or caregiver, you should never reheat breast milk in the microwave. Microwaving can create hot spots that can scald your baby's mouth. Instead, gently warm breast milk by placing the container in a bowl of warm water or using a bottle warmer.
  7. Vegetables
    Reheating certain vegetables in the microwave can result in a loss of nutrients and undesirable texture changes. Leafy greens, such as spinach and kale, can become wilted and mushy, while cruciferous vegetables, like broccoli and Brussels sprouts, can develop an unpleasant, sulfuric smell. Steaming or sautéing vegetables is a better way to reheat them while preserving their nutritional value and quality.
While the microwave is undoubtedly a convenient kitchen appliance, exercising caution when reheating certain foods is essential. Avoid using the microwave for hard-boiled eggs, fried foods, breast milk, rice, and pasta with tomato sauce.

Opt for alternative methods such as stovetop, oven, or a gentle warming technique to ensure your food remains safe and enjoyable. By following these guidelines, you'll not only prevent potential safety hazards but also maintain the flavor and texture of your favorite dishes.
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